Effect of nitrogen and phosphorus fertilization on dry matter accumulation law and yield formation of oil flax in irrigated field

Dry matters accumulation law and yield formation of oil flax in irrigated field in various nitrogen and phosphorus fertilization were studied by connecting field with lab analysis.The result showed that low nitrogen(75kg/hm2)fertilization and phosphorus middle fertilization(150kg/hm2)improved maximum the dry matters accumulation,which increased of 44.11mg/d and 46.16mg/d,and 22.84%and28.70%higher than no fertilization.Fertilization at 150kg/hm2 with nitrogen and phosphorus accumulated the maximum the dry matters,and the daily increasing was 49.30mg/d,each plant get 4.95 g,which was37.44%and 37.03%higher than no fertilization.The final and maximum accumulation and distribution in root,stem,leaves and grain were found at low phosphorus(75kg/hm2),high nitrogen(150kg/hm2)and high phosphorus(225kg/hm2),high nitrogen and low phosphorus,middle phosphorus,nitrogen and phosphorus at 150kg/hm2.Low nitrogen contributed the leaf material for grain transfer rate and contribution rate was the maximum.All treatments were significantly higher than no fertilization.High nitrogen andphosphorus at 150~225kg/hm2 was better for the formation of output.Low nitrogen and middle phosphorus get the maximum the output,reached 2 200.00kg/hm2,was 36.43%higher than no fertilization.It is suggested that nitrogen at 150kg/hm2 and phosphorus at 150~225kg/hm2 increase dry matter accumulation in oil flax,the final dry matter accumulation and distribution of the grain and output formation could be the maximum.